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Simplifying 3x + -1(2x + -7) = -21 Reorder the terms: 3x + -1(-7 + 2x) = -21 3x + (-7 * -1 + 2x * -1) = -21 3x + (7 + -2x) = -21 Reorder the terms: 7 + 3x + -2x = -21 Combine like terms: 3x + -2x = 1x 7 + 1x = -21 Solving 7 + 1x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1x = -21 + -7 Combine like terms: 7 + -7 = 0 0 + 1x = -21 + -7 1x = -21 + -7 Combine like terms: -21 + -7 = -28 1x = -28 Divide each side by '1'. x = -28 Simplifying x = -28
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